That verse is from the book of the Bible that most angers me--II Peter.
If you follow the writings of Paul, you realize that with Paul's encouragement many early Christians opted to forgo marriage and childbearing due to the conviction that Christ would return in their generation after a period of violence that would be particularly unfortunate for mothers and their small children. This belief was based on Christ's prophesy recorded in Matt. 24, Mark 13 and Luke 21 that states, "...this generation will not pass away until all these things take place."
By the time of the writing of II Peter, most if not all of that generation had passed away. So, people were questioning. The writer of II Peter hand-waves those lives sacrificed to a false belief aside by deftly re-framing the prophecy in a way that renders it untouchable. Now, with God a day is as a thousand years and a thousand years is as a day. Jesus' prediction of his return in "this generation" can now mean anytime, ever.
Too bad. So sad.
Then, just to be on the safe side, the writer pronounces Paul's writings hard to understand and any literal understanding of their meaning a sign that one is ignorant and unstable, thereby robbing those writings of any risk of reinforcing the sad mistake that many of Paul's followers had made.
Rug. Broom. Sweep.
The rest of the book is a paean to colorful insults, claims to sole ownership of orthodoxy and spectral threats.